Recent advances in the study of solid surfaces and thin films using variable-energy positron
beams are reviewed. In the first part the authors discuss the process of positron moderation …

It has long been recognised that the discontinuity in potential at a crystal surface can trap
electrons in a surface state. As early as the 1930's Tamml and Shockleyz showed that …

A surface dielectric function of a semi-infinite plane-bounded metal is defined in the spirit of
the plasmon-pole dielectric function of the bulk. It is modeled in such a way that the surface …

The decay rate has been determined for positrons annihilating with electrons while localized
in the image-induced potential well at the (110) surface of a clean well-annealed single …

This Letter reports on the first discrete-lattice calculation of positron surface states on the
surfaces of Al. The authors reproduce the observed values and anisotropy of the binding …

Abstract Well-characterized Al (111) and Al (100) samples were studied with monoenergetic
positrons before and after exposure to oxygen. Both positronium-formation and positron …

Both positrons and electrons can be bound to metal surfaces by image-correlation
interactions. For electrons, the image potential dominates, preventing the electron from …

Abstract Recent experiments (Mills, 1978-79) on the emission of positrons from surfaces are
shown to imply that positrons are trapped in a surface state prior to emission. A formal …

A simple unitary-transformation formalism, successfully applied to the bulk polaron problem,
is used in order to investigate the ground-state properties of an electron near a surface of a …

In this paper we present results of theoretical studies of positron states and annihilation
characteristics at the clean surfaces of alkali metals. Positron surface states and positron …